su binary out of date

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Binary search Tree

Binary lookup trees (binary search tree, also known as binary tree or binary sort tree) is a very important data structure, many high-level tree structures are two binary search tree variants, such as AVL tree, red and black trees, understanding

Use the log system to protect Linux security and force the user to be kicked out of the login

In a Linux system, there are three main types of log subsystems:1. Connection time log: Executed by multiple programs, write records to/var/log/wtmp and/var/run/utmp,login and other programs will update wtmp and utmp files, allowing system

Summary of the basic operations of Linux, basic operations of linux

Summary of the basic operations of Linux, basic operations of linux Preface Linux was a UNIX-compatible operating system developed in 1991 and can be used for free. Its source code can be freely transmitted and can be modified, enriched, and

UNIX Emergency Response Security Strategy

Remember: the operations on the affected system may change the existing evidence or lead to the loss of sensitive information! {Initial response }} Objective: To obtain the loss-prone data in the system before judicial authentication and replication,

Hacker attacks commonly used cmd command Daquan

Hacker Common Command DaquanNET user Heibai Lovechina/add plus one heibai password for Lovechinanet localgroup Administrators heibai/add him into the administrator groupnet start Telnet on each other's Telnet serviceNET use z:\127.0.0.1c$ map each

Graph theory 500 Questions!

Life and death to see the light Gan, this is the lives!============================= below is the minimum spanning tree + and check set ======================================"HDU"1213 how many Tables Foundation and check SET ★1272 Little Nozomi's

Introduction of Linux Users and groups and use of related commands

User and Group IntroductionUser Category:AdministratorNormal UserSystem usersLogged in userUser id: UserID, UID16bits binary Number: 0-65535Admin: 0Normal Users: 1-65635System User: 1-499 (CentOS6), 1-999 (CentOS7)Login User: 500-60000 (CentOS6), 100

MySQL Initial Exploration-minor optimization/faq

18.2.1 MySQL server has gone away errors related to Lost connection to server during query. The most common cause of the MySQL server has gone away error is that the server times out and closes the connection. By default, if nothing happens, the

linux--Archives and Directory Management

Here is a summary of some of the recent Learning files and directory management knowledge pointsBlog Park-Bang Bang sauce Good **************************************related operations for directories**********************************1. Special

CentOS (10)--some important commands related to Linux file and directory management ②

In the end of the second phase of the Canton Fair Internship, and ushered in a few days of leisure, continue to learn Linux. In the previous essay on Linux learning CentOS (17)--some important commands related to Linux file and directory management,

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